Synchronization of asynchronous data signals
US4791652A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1987 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Jun 4, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/076
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An asynchronous data signal is synchronized by stuffing in dependence upon phase differences between the asynchronous signal and a resultant synchronized signal. The synchronized signal comprises tdm frames each including data bits and a stuffing opportunity bit, and a plurality of frames constitute a superframe in which different frames have different numbers of data bits. To compensate for the biassed timing of stuff requests which would otherwise occur relative to the frame timing in the superframes, the threshold value with which the phase difference is compared to produce the stuff requests is modified with a stepped sawtooth waveform having a period equal to that of the superframe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.